<!DOCTYPE html>
<html>
  <head>
    <!-- Should be ignored inside fenced-frame -->
    <meta name="viewport" content="width=2000,minimum-scale=2">
    <style type="text/css">
      html {
        width: 100%;
      }
      div {
        width: 100px;
        height: 100px;
        background-color: red;
      }
    </style>
  </head>
  <body>
    <div>100x100</div>
  </body>
</html>
